1998-11-30 22:35:26 -05:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
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"http://www.w3.org/TR/REC-html40/loose.dtd">
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<HTML>
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<TITLE>expat FAQ</TITLE>
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<BODY>
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<H1>Frequently Asked Questions about Expat</H1>
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<H4>Where can I get the latest version of expat?</H4>
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<p>The latest production version is always available from <a
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href="ftp://ftp.jclark.com/pub/xml/expat.zip"
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1999-04-19 22:59:32 -04:00
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>ftp://ftp.jclark.com/pub/xml/expat.zip</a>. If there is a test
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version, then it will be available from <a
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1998-11-30 22:35:26 -05:00
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href="ftp://ftp.jclark.com/pub/test/expat.zip"
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>ftp://ftp.jclark.com/pub/test/expat.zip</a>.</p>
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<H4>Where can I get help in using expat?</H4>
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<p>Try the xml-dev mailing list (subscribe by mailing to <a
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href="mailto:majordomo@ic.ac.uk">majordomo@ic.ac.uk</a> with the
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message <code>subscribe xml-dev</code>). Alternatively try the <a
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href="news:comp.text.xml">comp.text.xml</a> USENET newsgroup.</p>
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<H4>Where is expat's API documented?</H4>
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<p>In <code>xmlparse/xmlparse.h</code>. There's also an advanced,
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low-level API you can use which is documented in
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<code>xmltok/xmltok.h</code>.</p>
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<H4>Is there a simple example of using expat's API?</H4>
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<p>See <code>sample/elements.c</code></p>
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<H4>How can I get expat to deal with non-ASCII characters?</H4>
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<P>By default, expat assumes that documents are encoded in UTF-8. In
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UTF-8, ASCII characters are represented by a single byte as they would
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be in ASCII, but non-ASCII characters are represented by a sequence of
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two or more bytes all with the 8th bit set. The encoding most widely
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used for European languages is ISO 8859-1 which is not compatible with
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UTF-8. To use this encoding, expat must be told either by supplying
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an argument of <code>"iso-8859-1"</code> to
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<code>XML_ParserCreate</code>, or by starting the document with
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<code><?xml version="1.0" encoding="iso-8859-1"?></code>.</P>
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<H4>What encodings does expat support?</H4>
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<P>expat has built in support for the following encodings:</P>
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<ul>
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<li><code>utf-8</code></li>
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<li><code>utf-16</code></li>
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<li><code>iso-8859-1</code></li>
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<li><code>us-ascii</code></li>
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</ul>
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<P>Additional encodings can be supported by using
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<code>XML_SetUnknownEncodingHandler</code>.</P>
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<H4>How can I get expat to validate my XML documents?</H4>
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<p>You can't. expat is not a validating parser.</p>
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<H4>How can I get expat to read my DTD?</H4>
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<p>expat only reads the internal DTD subset. It doesn't process an
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external DTD nor parameter entity references. This behaviour is in
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conformance with the XML Recommendation.</p>
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<H4>Why does expat give the wrong result for the more complex example in
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Appendix D of the XML Recommendation?</H4>
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<P>expat does not process parameter entity references. (The XML
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Recommendation only requires parsers to process parameter entity
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references when validating. See section 4.4.8.)</P>
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<H4>Why does expat give the wrong result for test cases in James
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Clark's test suite in the <code>xmltest/valid/not-sa</code>?</H4>
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<P>expat doesn't process parameter entities.</P>
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<H4>How can I get expat to recover from errors?</H4>
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<p>You can't. All well-formedness errors stop processing. Note that
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the XML Recommendation does not permit conforming XML processors to
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continue normal processing after a fatal error.</p>
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<H4>How do I get at the characters between tags?</H4>
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<p>Use <code>XML_SetCharacterDataHandler</code>.</p>
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<ADDRESS>
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<A HREF="mailto:jjc@jclark.com">James Clark</A>
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</ADDRESS>
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</BODY>
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</HTML>
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